A new threat to Earth has emerged: the plant beast Neo-Plant. Tachibana Nene, renowned as the ace of the opposing organization Gravity Force, had been missing since a Neo-Plant attack. However, when a group of boys in a shelter were assaulted by Neo-Plant, Nene suddenly appeared and rescued them. Her actions contradicted the truth—that she had been brainwashed by Neo-Plant and was operating as a spy. Learning of a virus weapon developed by Dr. Muramatsu capable of annihilating Neo-Plant, Nene begins aggressively interrogating civilians, reversing roles by dominating and turning them into her sex slaves to extract information. As a result, Neo-Plant's plans advance further, spreading tragedy across the land.